On Mon, May 16, 2022 at 10:15:16AM +0800, qianfanguijin@xxxxxxx wrote:
> From: qianfan Zhao <qianfanguijin@xxxxxxx>
>
> OPP table value is get from allwinner lichee linux-3.10 kernel driver
>
> Signed-off-by: qianfan Zhao <qianfanguijin@xxxxxxx>
> ---
> arch/arm/boot/dts/sun8i-r40.dtsi | 42 ++++++++++++++++++++++++++++++++
> 1 file changed, 42 insertions(+)
>
> diff --git a/arch/arm/boot/dts/sun8i-r40.dtsi b/arch/arm/boot/dts/sun8i-r40.dtsi
> index 291f4784e86c..8949153eb0eb 100644
> --- a/arch/arm/boot/dts/sun8i-r40.dtsi
> +++ b/arch/arm/boot/dts/sun8i-r40.dtsi
> @@ -54,6 +54,36 @@ / {
> #size-cells = <1>;
> interrupt-parent = <&gic>;
>
> + cpu0_opp_table: opp_table0 {
> + compatible = "operating-points-v2";
> + opp-shared;
> +
> + opp-720000000 {
> + opp-hz = /bits/ 64 <720000000>;
> + opp-microvolt = <1000000 1000000 1300000>;
> + clock-latency-ns = <2000000>;
> + };
> +
> + opp-912000000 {
> + opp-hz = /bits/ 64 <912000000>;
> + opp-microvolt = <1100000 1100000 1300000>;
> + clock-latency-ns = <2000000>;
> + };
> +
> + opp-1008000000 {
> + opp-hz = /bits/ 64 <1008000000>;
> + opp-microvolt = <1160000 1160000 1300000>;
> + clock-latency-ns = <2000000>;
> + };
> +
> + /* The opp table of the cpu frequency that exceeds 1G
> + * is not defined here. They require higher operating
> + * current, which may exceed the 500mA limited if the
> + * system is powered by USB. You can add them to the
> + * board's DTS is you make sure.
> + */
That's not the issue though. The issue is that the board is setup with a
CPU voltage at 1160mV, and if we raise the frequency to a higher OPP
without raising the voltage as well, the CPU will crash.
Maxime
